Sospan, from a dull memory the two pack systems followed on from cellulose and were potentially more injurious to health as they had isocyanate in their make up. Permobel was an ICI product name for their enamel paint which was generally used on commercial vehicles.. Cellulose and enamel paints were around at the same period in time, multiple coats of cellulose was the norm where the finish could be polished with T cut when dry to remove imperfections generally used for higher quality jobs and was quicker drying than enamel, which was a one coat material that could not be overcoated and would react if overcoated with it`s self even minutes after application, it was a one coat wonder that had high gloss straight from the gun and any imperfections in the finish were there to stay, as they could not be polished out. Two pack paints followed on where a hardner was mixed in with the colour and on sprayed together. All very different from today`s water based finishes, I gave up painting my cars before they arrived on scene..
